MSE: Maintain continuity in sequence appendMode across ResetParserState

media/filters/frame_processor.cc

Index: media/filters/frame_processor.cc
diff --git a/media/filters/frame_processor.cc b/media/filters/frame_processor.cc
index e77e452fd8e184f0b5a8b06cad657afd9e5ff8a9..80c5dab1980a0570e95a50aca8c155c694d2b61a 100644
--- a/media/filters/frame_processor.cc
+++ b/media/filters/frame_processor.cc
@@ -287,6 +287,11 @@ void FrameProcessor::Reset() {
        itr != track_buffers_.end(); ++itr) {
     itr->second->Reset();
   }
+
+  if (sequence_mode_) {
+    DCHECK(kNoTimestamp() != group_end_timestamp_);
+    group_start_timestamp_ = group_end_timestamp_;
+  }
 }
 
 void FrameProcessor::OnPossibleAudioConfigUpdate(